Fam. Asplanchnidae.

Asplanchna brightwelli Gosse.

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This footless Rotiferon may be considered fairly common in North Otago And South Canterbury, although a year may be passed with frequent searching without coming across a single specimen. They are most likely to be met with between May and July in small ponds, and they seem to prefer the company of other species of Rotifers. The New Zealand representatives are smaller than the European, the females varying in size from 1/40 into 1/50 in.

Asplanchnopus myrmeleo Ehrenberg.

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One of the finest species in the class, and plentiful from the Shag River to the Waitaki. Usually associated with Hydatina senta and various Brachioni. My specimens, which are all females, measure from 1/25 in. to ⅓0 in.